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Note 7 - Net Income (Loss) Per Share (Tables)
9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2014
   
2013
   
2014
   
2013
 
Basic net income (loss) per share:
                       
Numerator:
                       
Net income (loss)
  $ (1,619 )   $ 205     $ (2,568 )   $ (2,427 )
Less: Net income attributable to participating securities
          136              
Net income (loss) attributable to common stockholders
  $ (1,619 )   $ 69     $ (2,568 )   $ (2,427 )
Denominator:
                               
Weighted average shares used
    7,678       7,248       7,572       7,228  
Basic net income (loss) per share
  $ (0.21 )   $ 0.01     $ (0.34 )   $ (0.34 )
Diluted net income (loss) per share:
                               
Numerator:
                               
Net income (loss) attributable to common stockholders used in basic EPS computation
  $ (1,619 )   $ 69     $ (2,568 )   $ (2,427 )
Reallocation of net income attributable to participating securities
    -       136       -       -  
Net income (loss) attributable to common stockholders
  $ (1,619 )   $ 205     $ (2,568 )   $ (2,427 )
Denominator: 
                               
Weighted average shares used in basic EPS computation
    7,678       7,248       7,572       7,228  
Effect of potentially dilutive securities:
                               
      Convertible preferred stock
          14,445              
      Stock options
          1,503              
Weighted average shares used
    7,678       23,196       7,572       7,228  
      Diluted net income (loss) per share   $  (0.21 )   $  0.01     $  (0.34 )   $  (0.34 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2014
   
2013
   
2014
   
2013
 
Convertible preferred stock
    14,445             14,445       14,445  
Stock options
    5,195       1,713       5,195       4,811  
RSUs
    625       225       625       225  
Convertible preferred stock warrants
    113       113       113       113  
      20,378       2,051       20,378       19,594